Add this to digits and get the ordinal representation like 1st, 2nd 3rd, 113th, etc. (logic borrowed from Rails ordinalize helper)

ordinalize.js

(function () {
  'use strict';

  angular.module('ConferenceRoomApp').filter('ordinalize', function () {
    return function (number) {
      var res = number.toString();

      if (/(11|12|13)/.test(Math.abs(number) % 100)) {
        res = number + 'th';
      } else {
        switch(number) {
        case 1:
          res = number + 'st';
          break;
        case 2:
          res = number + 'nd';
          break;
        case 3:
          res = number + 'rd';
          break;
        default:
          res = number + 'th';
        }
      }

      return res;
    };
  });

})();